Description
Glucosamine sulfate as the potassium chloride stabilised salt, 1,500 milligrams in a single daily dose, 90 servings at about 29 cents each. This is the form and the schedule used across the European trials, which is the reason it is stocked. Most American bottles sell glucosamine sulfate as the hydrochloride instead and split the daily amount across three tablets, and neither of those choices is cosmetic.
What is in the serving
| Compound | glucosamine sulfate potassium chloride, the stabilised crystalline salt |
|---|---|
| Amount | 1,500 mg of the salt, taken once a day |
| Glucosamine itself | roughly 1,180 mg of that figure |
| Servings | 90 per bottle, three months at one a day |
| Potassium | present as part of the salt, stated on the panel |
| Allergen | shellfish derived, flagged in plain words |
| Cost | about 29 cents a serving, printed per gram under the price |
The weight inside the weight on a glucosamine sulfate label
Fifteen hundred milligrams of the stabilised sulfate salt is not 1,500 milligrams of glucosamine. The sulfate group and the potassium chloride that keeps the crystal stable are both part of that stated weight, so the glucosamine fraction works out nearer 1,180 milligrams. Our panel prints both numbers rather than the flattering one, because the comparison between two bottles is impossible otherwise.
The hydrochloride form carries a higher proportion of glucosamine per milligram, which sounds like an advantage until you notice it was not the material most of the long trials used. Compound weight against active weight is the same arithmetic the minerals page applies to magnesium and calcium salts, and it catches out more shoppers in this aisle than any other single figure.
Why one dose a day rather than three
Because that is how the trials administered it. The crystalline sulfate studies gave the full 1,500 milligrams in a single daily dose, while the American convention of three 500 milligram tablets came from the hydrochloride products. A bottle of 90 at one a day is therefore three months, where a 90 count bottle taken three at a time is thirty days.
That difference decides the real price. Units per serving sits beside servings per container on every listing across the joint and bone page, since a cheap looking bottle at four tablets a serving is usually the expensive one per day.
How long a glucosamine sulfate course runs in the literature
The trials that reported radiographic outcomes ran for one to three years, not one to three months. That is the timescale this ingredient has been studied on, and a single 90 day bottle of glucosamine sulfate is a quarter of the shortest of them. Anyone deciding whether it was worth it after a fortnight is deciding a good deal earlier than the published work would allow. Printing the duration next to the dose is the only way a label can make that visible.
The potassium in the name
The 2KCl in the product title is potassium chloride, used to stabilise the crystal. It means a small amount of potassium arrives with each dose, which is irrelevant for most people and not irrelevant for anyone on a potassium restricted diet or a medicine that affects potassium handling. The figure is on the panel, and the reference intakes are on the NIH potassium fact sheet.
What the long trials measured
The three year European studies gave 1,500 milligrams of crystalline glucosamine sulfate once daily and measured joint space width on standardised knee radiographs alongside a validated pain and function index. Shorter trials using the hydrochloride form reported more mixed results on the same kinds of outcome. That describes the doses administered and the instruments read in the published literature, including the inconsistency between forms, and it is not a claim about this bottle.
The shellfish line, in plain words
Commercial glucosamine is made from crustacean shells, so this is a shellfish derived ingredient and the panel says so rather than burying it. Fermentation produced vegetarian glucosamine exists as a separate article. Anyone with a shellfish allergy should be reading the allergen statement rather than the front label.
Testing
Every lot of glucosamine sulfate is identity tested and assayed by an independent laboratory for both the salt and the glucosamine fraction, with heavy metals and microbials screened alongside. Lots under their printed amount are withdrawn from sale and the failing certificate stays published rather than disappearing, for the reason set out in why we publish the batch that failed. The certificate covering your bottle is linked above.
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